Current behaviour: At character generation, if you've elected to create a Ranger, the character's Stealth score can be seen displayed in the summary after proceeding past the Skills screen (e.g., for a DEX 13 human, the base score of 25 is shown). However, once the game has started, taking a gander at the character sheet reveals that the Stealth score has decreased by 3 points.
Expected behaviour: The Ranger's Stealth score shouldn't decrease between character generation and game start.
Games affected: BG2, BGEE.
Notes: The bug affects characters of all races, ability scores, and multi-class Cleric/Rangers, as well. Perhaps there's some sort of halving of some Move Silently or Hide in Shadows value occurring behind the scenes between character-gen and game start. BG1 is not affected by this bug.